TY  - JOUR
A1  - Dietze, Michael
A1  - Krautblatter, Michael
A1  - Illien, Luc
A1  - Hovius, Niels
T1  - Seismic constraints on rock damaging related to a failing mountain peak
BT  - The Hochvogel, Allgäu
JF  - Earth surface processes and landforms
N2  - Large rock slope failures play a pivotal role in long-term landscape evolution and are a major concern in land use planning and hazard aspects. While the failure phase and the time immediately prior to failure are increasingly well studied, the nature of the preparation phase remains enigmatic. This knowledge gap is due, to a large degree, to difficulties associated with instrumenting high mountain terrain and the local nature of classic monitoring methods, which does not allow integral observation of large rock volumes. Here, we analyse data from a small network of up to seven seismic sensors installed during July-October 2018 (with 43 days of data loss) at the summit of the Hochvogel, a 2592 m high Alpine peak. We develop proxy time series indicative of cyclic and progressive changes of the summit. Modal analysis, horizontal-to-vertical spectral ratio data and end-member modelling analysis reveal diurnal cycles of increasing and decreasing coupling stiffness of a 260,000 m(3) large, instable rock volume, due to thermal forcing. Relative seismic wave velocity changes also indicate diurnal accumulation and release of stress within the rock mass. At longer time scales, there is a systematic superimposed pattern of stress increased over multiple days and episodic stress release within a few days, expressed in an increased emission of short seismic pulses indicative of rock cracking. Our data provide essential first order information on the development of large-scale slope instabilities towards catastrophic failure. (c) 2020 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd
KW  - environmental seismology
KW  - fatigue
KW  - fundamental frequency
KW  - HVSR
KW  - mass
KW  - wasting
KW  - mountain geomorphology
KW  - natural hazard
KW  - noise cross
KW  - correlation
KW  - seismic monitoring
KW  - slope failure
Y1  - 2021
U6  - https://doi.org/10.1002/esp.5034
SN  - 0197-9337
SN  - 1096-9837
VL  - 46
IS  - 2
SP  - 417
EP  - 429
PB  - Wiley
CY  - Hoboken
ER  - 
TY  - GEN
A1  - Dietze, Michael
A1  - Krautblatter, Michael
A1  - Illien, Luc
A1  - Hovius, Niels
T1  - Seismic constraints on rock damaging related to a failing mountain peak
BT  - The Hochvogel, Allgäu
T2  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - Large rock slope failures play a pivotal role in long-term landscape evolution and are a major concern in land use planning and hazard aspects. While the failure phase and the time immediately prior to failure are increasingly well studied, the nature of the preparation phase remains enigmatic. This knowledge gap is due, to a large degree, to difficulties associated with instrumenting high mountain terrain and the local nature of classic monitoring methods, which does not allow integral observation of large rock volumes. Here, we analyse data from a small network of up to seven seismic sensors installed during July-October 2018 (with 43 days of data loss) at the summit of the Hochvogel, a 2592 m high Alpine peak. We develop proxy time series indicative of cyclic and progressive changes of the summit. Modal analysis, horizontal-to-vertical spectral ratio data and end-member modelling analysis reveal diurnal cycles of increasing and decreasing coupling stiffness of a 260,000 m(3) large, instable rock volume, due to thermal forcing. Relative seismic wave velocity changes also indicate diurnal accumulation and release of stress within the rock mass. At longer time scales, there is a systematic superimposed pattern of stress increased over multiple days and episodic stress release within a few days, expressed in an increased emission of short seismic pulses indicative of rock cracking. Our data provide essential first order information on the development of large-scale slope instabilities towards catastrophic failure. (c) 2020 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1360 
KW  - environmental seismology
KW  - fatigue
KW  - fundamental frequency
KW  - HVSR
KW  - mass
KW  - wasting
KW  - mountain geomorphology
KW  - natural hazard
KW  - noise cross
KW  - correlation
KW  - seismic monitoring
KW  - slope failure
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-568787
SN  - 1866-8372
IS  - 2
ER  -